#include <REGX52.H>

void Delay1ms(unsigned int xms)		//@12.000MHz
{
	unsigned char i, j;
	while (xms)
	{
			i = 2;
			j = 239;
			do
			{
				while (--j);
			} while (--i);
			xms--;
	
	}
	}
void main ()
{
		P2=0XFE;//1111 1110?
		Delay1ms(1000);//??500ms
		P2=0xFD;//1111 1101?
		Delay1ms(1000);//??500ms
		P2=0xFB;//1111 1011?
		Delay1ms(1000);//??500ms
		P2=0xF7;//1111 0111?
		Delay1ms(1000);//??500ms
		P2=0xEF;//1110 1111?
		Delay1ms(1000);//??500ms
		P2=0xDF;//1101 1110?
		Delay1ms(1000);//??500ms
		P2=0xBF;//1011 1110?
		Delay1ms(1000);//??500ms
		P2=0x7F;//0111 1110?
		Delay1ms(1000);//??500ms
}
